Accessory element for window system



FIG. 1 is a perspective view taken from the front, bottom and right sideof an accessory element for window system;

FIG. 2 is a perspective view taken from the front, top and right side ofthe accessory element for window system of FIG. 1; and,

FIG. 3 is a bottom plan view of the accessory element for window systemof FIG. 1.

The left side of the accessory element for window system of FIG. 1 is amirror image of the right side, and the rear of the accessory elementfor window system of FIG. 1 is a mirror image of the front.

The broken lines of the drawings disclose environmental structure thatforms no part of the claimed design.

CLAIM The ornamental design for an accessory element for window system,as shown and described.